IPB Halle: Leibniz-Institut für Pflanzenbiochemie Deutsch

Lange Nacht, die Wissen schafft

4. Juli 2025 am IPB
IPB-Newsletter | April 2025
Wir verstehen Pflanzen!

Der Film zum Institut
Molekulare Signalverarbeitung

Prof. Dr. Steffen Abel
Wie Pflanzen ihrer Umwelt trotzen.
Natur- und Wirkstoffchemie

Prof. Dr. Ludger Wessjohann
Die Chemie der Natur – Basis für Wirkstoffe zur Gesunderhaltung von Mensch und Pflanze.
Biochemie pflanzlicher Interaktionen

Prof. Dr. Tina Romeis
Wechselwirkungen in, von und mit Pflanzen.
Stoffwechsel- und Zellbiologie

Prof. Dr. Alain Tissier
Sekundär jedoch nicht zweitrangig - Die biologischen Funktionen pflanzlicher Sekundärmetaboliten.
Unabhängige Nachwuchsgruppe

Dr. Mariana Schuster

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Im Rahmen der Wirkstofftage am 9. April 2025 verlieh das Leibniz-Forschungsnetzwerk Wirkstoffe den Preis „Leibniz-Wirkstoff des Jahres“ 2025 an Dr. Ibrahim Morgan, Dr. Robert Rennert, Dr. Tuvshinjargal Budragchaa und Prof.…

Seit Februar 2021 bietet Wolfgang Brandt, ehemaliger Leiter der Arbeitsgruppe Computerchemie am IPB, sein Citizen Science-Projekt zur Pilzbestimmung an. Dafür hat er in regelmäßigen Abständen öffentliche Vorträge zur Vielfalt…

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Stellenausschreibungen

Laborantin bzw. Technischer Assistent*in (m/w/d) (9/2025)

Datum: 08.04.2025 Referenznummer: 9/2025

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Publikation

Ortmann, S.; Marx, J.; Lampe, C.; Handrick, V.; Ehnert, T.-M.; Zinecker, S.; Reimers, M.; Bonas, U.; Lee Erickson, J.; A conserved microtubule-binding region in Xanthomonas XopL is indispensable for induced plant cell death reactions PLOS Pathog. 19 e1011263 (2023) DOI: 10.1371/journal.ppat.1011263

Pathogenic Xanthomonas bacteria cause disease on more than 400 plant species. These Gram-negative bacteria utilize the type III secretion system to inject type III effector proteins (T3Es) directly into the plant cell cytosol where they can manipulate plant pathways to promote virulence. The host range of a given Xanthomonas species is limited, and T3E repertoires are specialized during interactions with specific plant species. Some effectors, however, are retained across most strains, such as Xanthomonas Outer Protein L (XopL). As an ‘ancestral’ effector, XopL contributes to the virulence of multiple xanthomonads, infecting diverse plant species. XopL homologs harbor a combination of a leucine-rich-repeat (LRR) domain and an XL-box which has E3 ligase activity. Despite similar domain structure there is evidence to suggest that XopL function has diverged, exemplified by the finding that XopLs expressed in plants often display bacterial species-dependent differences in their sub-cellular localization and plant cell death reactions. We found that XopL from X. euvesicatoria (XopLXe) directly associates with plant microtubules (MTs) and causes strong cell death in agroinfection assays in N. benthamiana. Localization of XopLXe homologs from three additional Xanthomonas species, of diverse infection strategy and plant host, revealed that the distantly related X. campestris pv. campestris harbors a XopL (XopLXcc) that fails to localize to MTs and to cause plant cell death. Comparative sequence analyses of MT-binding XopLs and XopLXcc identified a proline-rich-region (PRR)/α-helical region important for MT localization. Functional analyses of XopLXe truncations and amino acid exchanges within the PRR suggest that MT-localized XopL activity is required for plant cell death reactions. This study exemplifies how the study of a T3E within the context of a genus rather than a single species can shed light on how effector localization is linked to biochemical activity.

Publikation

Rodríguez-Núñez, K.; Cortés-Monroy, A.; Serey, M.; Ensari, Y.; Davari, M. D.; Bernal, C.; Martinez, R.; Modulating substrate specificity of Rhizobium sp. Histamine Dehydrogenase through protein engineering for food quality applications Molecules 28 3748 (2023) DOI: 10.3390/molecules28093748

Publikation

Rashan, L. J.; Özenver, N.; Boulos, J. C.; Dawood, M.; Roos, W. P.; Franke, K.; Papasotiriou, I.; Wessjohann, L. A.; Fiebig, H.-H.; Efferth, T.; Molecular modes of action of an aqueous Nerium oleander extract in cancer cells in vitro and in vivo Molecules 28 1871 (2023) DOI: 10.3390/molecules28041871

Cancer drug resistance remains a major obstacle in clinical oncology. As most anticancer drugs are of natural origin, we investigated the anticancer potential of a standardized cold-water leaf extract from Nerium oleander L., termed Breastin. The phytochemical characterization by nuclear magnetic resonance spectroscopy (NMR) and low- and high-resolution mass spectrometry revealed several monoglycosidic cardenolides as major constituents (adynerin, neritaloside, odoroside A, odoroside H, oleandrin, and vanderoside). Breastin inhibited the growth of 14 cell lines from hematopoietic tumors and 5 of 6 carcinomas. Remarkably, the cellular responsiveness of odoroside H and neritaloside was not correlated with all other classical drug resistance mechanisms, i.e., ATP-binding cassette transporters (ABCB1, ABCB5, ABCC1, ABCG2), oncogenes (EGFR, RAS), tumor suppressors (TP53, WT1), and others (GSTP1, HSP90, proliferation rate), in 59 tumor cell lines of the National Cancer Institute (NCI, USA), indicating that Breastin may indeed bypass drug resistance. COMPARE analyses with 153 anticancer agents in 74 tumor cell lines of the Oncotest panel revealed frequent correlations of Breastin with mitosis-inhibiting drugs. Using tubulin-GFP-transfected U2OS cells and confocal microscopy, it was found that the microtubule-disturbing effect of Breastin was comparable to that of the tubulin-depolymerizing drug paclitaxel. This result was verified by a tubulin polymerization assay in vitro and molecular docking in silico. Proteome profiling of 3171 proteins in the NCI panel revealed protein subsets whose expression significantly correlated with cellular responsiveness to odoroside H and neritaloside, indicating that protein expression profiles can be identified to predict the sensitivity or resistance of tumor cells to Breastin constituents. Breastin moderately inhibited breast cancer xenograft tumors in vivo. Remarkably, in contrast to what was observed with paclitaxel monotherapy, the combination of paclitaxel and Breastin prevented tumor relapse, indicating Breastin’s potential for drug combination regimens.

Publikation

Tousif, M. I.; Nazir, M.; Saleem, M.; Tauseef, S.; Shafiq, N.; Hassan, L.; Hussain, H.; Montesano, D.; Naviglio, D.; Zengin, G.; Ahmad, I.; Psidium guajava L. an incalculable but underexplored food crop: Its phytochemistry, ethnopharmacology, and industrial applications Molecules 27 7016 (2022) DOI: 10.3390/molecules27207016

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Lange Nacht, die Wissen schafft

IPB-Newsletter | April 2025

Wir verstehen Pflanzen!

Molekulare Signalverarbeitung

Natur- und Wirkstoffchemie

Biochemie pflanzlicher Interaktionen

Stoffwechsel- und Zellbiologie

Unabhängige Nachwuchsgruppe

Aktuelles

+++ Newsticker Wissenschaft #181 +++ Maschinelles Lernen +++

Preisverleihung zu den Wirkstofftagen: “Leibniz-Wirkstoff des Jahres 2025” geht an IPB-Team für Krebsforschungsprojekt

Pilzsachverständige in Sachsen-Anhalt: Jubiläumsstimmung zur Frühjahrstagung

Stellenausschreibungen

Laborantin bzw. Technischer Assistent*in (m/w/d) (9/2025)

Publikationen

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